Results of far-infrared transmittance are reported for GdMnO<Subscript>3</Subscript>, a multiferroic perovskite manganite. The spectra allow to obtain position and intensity of the high-frequency electromagnon (~75 cm<Superscript>-1</Superscript>) in this material. We present a comparative analysis of the high- and low-frequency electromagnons...</superscript></subscript>

We have studied RMnO<Subscript>3</Subscript> manganites (R=Pr, Sm, Eu, Tb, Y) Raman excitations in the 200–2800 cm<Superscript>-1</Superscript> range as a function of temperature. Combinations of phonon energies are observed up to the fourth order, indicating the presence of electron-phonon coupling. In comparison to Γ-point phonon...</superscript></subscript>

The Ru-Ru spin-singlet formation in La<Subscript>2 − x </Subscript> L n <Subscript> x </Subscript>RuO<Subscript>5</Subscript> (Ln=Pr, Nd, Sm, Gd, Dy) was investigated by measurements of the specific heat and magnetic susceptibility. After subtraction of the lattice contribution from the specific heat (C <Subscript> p </Subscript>), similar excess entropy values were obtained for...</subscript></subscript></subscript></subscript>